A percentile rank represents someone’s score related to other people’s score. We commonly use percentile ranks to make sense of someone’s standardised test score. Percentile ranks are a common way to determine someone’s rank in a group of test takers. For example, if someone’s percentile rank is the 80th, that means the person’s test score was greater than 80% of the people who take the test. A percentile rank of 80 also means that 20% of the test takers scored higher than the person with a percentile rank of 80. A higher percentile rank means the test taker did well on the exam. Percentile ranks are easy to calculate with a few pieces of information. An example will be provided below.